centos8 修改yum 源

cd /etc/yum.repos.d
cp CentOS-Stream-BaseOS.repo CentOS-Stream-BaseOS.repo.bak

下载阿里云yum 源

wget -O CentOS-Stream-BaseOS.repo http://mirrors.aliyun.com/repo/Centos-8.repo

更新缓存

yum clean all
yum makecache

更新源

yum update -y